rotate: Resend API-key driver (create→verify→revoke)
First of the vibe-coder API-rotation batch. Resend mints a new API key authenticated by the old one (POST /api-keys), verifies it by listing keys with the new Bearer token and asserting its id is present, then deletes the old key by id (DELETE /api-keys/<id>). Self-contained blob resend://host/?id=&secret= keeps the token off Identity/Meta/logs/argv. httptest emulator enforces Bearer validity (key authenticates only while it exists) so the test proves a real cutover: old dead, new alive, plus a leak check. Recorded MOCK-ONLY in proofs.go + ROTATION-PROOFS.md (no self-host). Note: GitHub PAT is intentionally NOT an API Rotator — GitHub has no create-token API (classic Authorizations API removed 2020; fine-grained PATs are UI-only), so a PAT belongs in the guided/worklist path, not here. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
leetcrypt
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package rotate
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import (
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"net/url"
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"strings"
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"time"
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"incredigo/internal/discover"
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"incredigo/internal/vault"
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)
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// Resend rotates a Resend API key (re_...) via the REST API by CREATING a new key,
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// verifying it, then DELETING the old one — the provider-API rotation pattern
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// (create-new → verify → revoke-old):
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//
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// POST /api-keys (Bearer old-key) -> {id, token}
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// GET /api-keys (Bearer new-key) -> {data:[{id,...}]} (auth + membership proof)
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// DELETE /api-keys/<old-id> (Bearer old-key)
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//
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// A Resend key authenticates as `Authorization: Bearer re_...`; the token is returned
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// by Resend only once, at create time, alongside its id. Revoking the OLD key needs
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// that key's id, so the credential carries it. The credential's secret is a single
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// self-contained line:
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//
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// resend://<host>/?id=<key-id>&secret=<re_token>
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//
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// - scheme "resend" maps to https; "http"/"https" are accepted so a test can point
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// at a loopback emulator.
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// - <host> API host; "resend" (or empty) defaults to api.resend.com.
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// - id= the API key id (non-secret) — names the DELETE path for revoke-old.
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// - secret= the API key token (Bearer credential, rotated).
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//
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// SECURITY: the token lives only in the vault blob and the Bearer header; it never
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// reaches Identity/Meta/logs/argv. The new token is decoded straight from the create
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// response into the rebuilt blob.
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type Resend struct {
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// HTTPClient is injectable for tests / custom TLS. Defaults to a 15s-timeout client.
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HTTPClient *http.Client
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}
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// init self-registers the driver. Availability alone changes nothing; the
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// `rotate --execute` + INCREDIGO_ALLOW_EXECUTE=1 gate still applies.
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func init() { Register(&Resend{}) }
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// Name identifies the driver in plans and audit records.
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func (re *Resend) Name() string { return "resend" }
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// Detect claims credentials tagged Source == "resend".
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func (re *Resend) Detect(c discover.Credential) bool { return c.Source == "resend" }
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func (re *Resend) client() *http.Client {
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if re.HTTPClient != nil {
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return re.HTTPClient
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}
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return &http.Client{Timeout: 15 * time.Second}
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}
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// resendSecret is the parsed credential blob. None of its fields are ever logged.
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type resendSecret struct {
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base string // scheme://host
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id string // key id (non-secret)
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secret string // re_... Bearer token
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}
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func parseResendSecret(v *vault.Vault, h *vault.Handle) (resendSecret, error) {
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buf, err := v.Open(h)
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if err != nil {
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return resendSecret{}, err
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}
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u, err := url.Parse(strings.TrimSpace(string(buf.Bytes())))
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if err != nil {
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return resendSecret{}, fmt.Errorf("resend: parse secret url: %w", err)
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}
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if u.Scheme != "resend" && u.Scheme != "http" && u.Scheme != "https" {
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return resendSecret{}, fmt.Errorf("resend: unexpected scheme %q", u.Scheme)
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}
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scheme := u.Scheme
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host := u.Host
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if scheme == "resend" {
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scheme = "https"
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}
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if host == "" || host == "resend" {
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host = "api.resend.com"
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}
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q := u.Query()
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s := resendSecret{base: scheme + "://" + host, id: q.Get("id"), secret: q.Get("secret")}
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if s.secret == "" {
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return resendSecret{}, fmt.Errorf("resend: secret missing token")
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}
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return s, nil
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}
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// build re-encodes a resendSecret into the single-line blob form (scheme normalised
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// back to "resend").
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func (s resendSecret) build() string {
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host := hostOf(s.base)
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if host == "api.resend.com" {
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host = "resend"
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}
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u := &url.URL{Scheme: "resend", Host: host, Path: "/"}
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q := url.Values{}
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q.Set("id", s.id)
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q.Set("secret", s.secret)
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u.RawQuery = q.Encode()
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return u.String()
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}
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func (s resendSecret) keysURL(id string) string {
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base := s.base + "/api-keys"
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if id != "" {
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return base + "/" + url.PathEscape(id)
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}
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return base
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}
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// Rotate creates a NEW API key (authenticated by the OLD key) and returns a vault
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// handle to a rebuilt blob carrying the new id + token. It does not delete the old key.
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func (re *Resend) Rotate(ctx context.Context, c discover.Credential, v *vault.Vault) (*vault.Handle, error) {
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s, err := parseResendSecret(v, c.Secret)
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if err != nil {
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return nil, err
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}
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body, err := json.Marshal(map[string]string{"name": "incredigo-rotated", "permission": "full_access"})
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if err != nil {
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return nil, err
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}
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req, err := http.NewRequestWithContext(ctx, http.MethodPost, s.keysURL(""), bytes.NewReader(body))
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if err != nil {
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return nil, err
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}
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req.Header.Set("Content-Type", "application/json")
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req.Header.Set("Authorization", "Bearer "+s.secret)
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resp, err := re.client().Do(req)
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if err != nil {
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return nil, fmt.Errorf("resend: create key: %w", err)
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}
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defer func() { io.Copy(io.Discard, resp.Body); resp.Body.Close() }()
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if resp.StatusCode != http.StatusCreated && resp.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("resend: create key: unexpected status %s", resp.Status)
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}
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var created struct {
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ID string `json:"id"`
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Token string `json:"token"`
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}
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if err := json.NewDecoder(resp.Body).Decode(&created); err != nil {
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return nil, fmt.Errorf("resend: decode created key: %w", err)
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}
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if created.ID == "" || created.Token == "" {
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return nil, fmt.Errorf("resend: create key: empty id or token in response")
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}
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ns := s
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ns.id = created.ID
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ns.secret = created.Token
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return v.Store([]byte(ns.build())), nil
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}
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// Verify proves the newly minted key authenticates by listing keys with it and
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// confirming the new id is present (auth success + the key really exists).
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func (re *Resend) Verify(ctx context.Context, newSecret *vault.Handle, v *vault.Vault) error {
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s, err := parseResendSecret(v, newSecret)
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if err != nil {
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return err
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}
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, s.keysURL(""), nil)
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if err != nil {
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return err
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}
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req.Header.Set("Authorization", "Bearer "+s.secret)
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resp, err := re.client().Do(req)
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if err != nil {
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return fmt.Errorf("resend verify: %w", err)
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}
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defer func() { io.Copy(io.Discard, resp.Body); resp.Body.Close() }()
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if resp.StatusCode != http.StatusOK {
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return fmt.Errorf("resend verify: list keys status %s", resp.Status)
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}
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var got struct {
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Data []struct {
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ID string `json:"id"`
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} `json:"data"`
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}
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if err := json.NewDecoder(resp.Body).Decode(&got); err != nil {
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return fmt.Errorf("resend verify: decode keys: %w", err)
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}
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for _, k := range got.Data {
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if k.ID == s.id {
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return nil
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}
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}
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return fmt.Errorf("resend verify: new key id not present in account")
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}
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// RevokeOld deletes the OLD API key by its id. The old key is still valid at this
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// point (revoke runs only after the new key is stored+verified), so it authenticates
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// its own deletion.
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func (re *Resend) RevokeOld(ctx context.Context, c discover.Credential, v *vault.Vault) error {
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s, err := parseResendSecret(v, c.Secret)
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if err != nil {
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return err
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}
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if s.id == "" {
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return fmt.Errorf("resend revoke: credential has no key id")
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}
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req, err := http.NewRequestWithContext(ctx, http.MethodDelete, s.keysURL(s.id), nil)
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if err != nil {
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return err
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}
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req.Header.Set("Authorization", "Bearer "+s.secret)
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resp, err := re.client().Do(req)
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if err != nil {
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return fmt.Errorf("resend revoke: %w", err)
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}
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defer func() { io.Copy(io.Discard, resp.Body); resp.Body.Close() }()
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if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusNoContent {
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return fmt.Errorf("resend revoke: delete key status %s", resp.Status)
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}
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return nil
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}
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